src/Pure/PIDE/document.scala
author wenzelm
Fri Apr 06 23:34:38 2012 +0200 (2012-04-06 ago)
changeset 47388 fe4b245af74c
parent 46997 395b7277ed76
child 47395 e6261a493f04
permissions -rw-r--r--
discontinued obsolete last_execs (cf. cd3ab7625519);
     1 /*  Title:      Pure/PIDE/document.scala
     2     Author:     Makarius
     3 
     4 Document as collection of named nodes, each consisting of an editable
     5 list of commands, associated with asynchronous execution process.
     6 */
     7 
     8 package isabelle
     9 
    10 
    11 import scala.collection.mutable
    12 
    13 
    14 object Document
    15 {
    16   /* formal identifiers */
    17 
    18   type ID = Long
    19   val ID = Properties.Value.Long
    20 
    21   type Version_ID = ID
    22   type Command_ID = ID
    23   type Exec_ID = ID
    24 
    25   val no_id: ID = 0
    26   val new_id = Counter()
    27 
    28 
    29 
    30   /** document structure **/
    31 
    32   /* individual nodes */
    33 
    34   type Edit[A, B] = (Node.Name, Node.Edit[A, B])
    35   type Edit_Text = Edit[Text.Edit, Text.Perspective]
    36   type Edit_Command = Edit[(Option[Command], Option[Command]), Command.Perspective]
    37 
    38   type Node_Header = Exn.Result[Node.Deps]
    39 
    40   object Node
    41   {
    42     sealed case class Deps(
    43       imports: List[Name],
    44       keywords: List[Outer_Syntax.Decl],
    45       uses: List[(String, Boolean)])
    46 
    47     object Name
    48     {
    49       val empty = Name("", "", "")
    50       def apply(path: Path): Name =
    51       {
    52         val node = path.implode
    53         val dir = path.dir.implode
    54         val theory = Thy_Header.thy_name(node) getOrElse error("Bad theory file name: " + path)
    55         Name(node, dir, theory)
    56       }
    57 
    58       object Ordering extends scala.math.Ordering[Name]
    59       {
    60         def compare(name1: Name, name2: Name): Int = name1.node compare name2.node
    61       }
    62     }
    63     sealed case class Name(node: String, dir: String, theory: String)
    64     {
    65       override def hashCode: Int = node.hashCode
    66       override def equals(that: Any): Boolean =
    67         that match {
    68           case other: Name => node == other.node
    69           case _ => false
    70         }
    71       override def toString: String = theory
    72     }
    73 
    74     sealed abstract class Edit[A, B]
    75     {
    76       def foreach(f: A => Unit)
    77       {
    78         this match {
    79           case Edits(es) => es.foreach(f)
    80           case _ =>
    81         }
    82       }
    83     }
    84     case class Clear[A, B]() extends Edit[A, B]
    85     case class Edits[A, B](edits: List[A]) extends Edit[A, B]
    86     case class Header[A, B](header: Node_Header) extends Edit[A, B]
    87     case class Perspective[A, B](perspective: B) extends Edit[A, B]
    88 
    89     def command_starts(commands: Iterator[Command], offset: Text.Offset = 0)
    90       : Iterator[(Command, Text.Offset)] =
    91     {
    92       var i = offset
    93       for (command <- commands) yield {
    94         val start = i
    95         i += command.length
    96         (command, start)
    97       }
    98     }
    99 
   100     private val block_size = 1024
   101 
   102     val empty: Node = new Node()
   103   }
   104 
   105   final class Node private(
   106     val header: Node_Header = Exn.Exn(ERROR("Bad theory header")),
   107     val perspective: Command.Perspective = Command.Perspective.empty,
   108     val blobs: Map[String, Blob] = Map.empty,
   109     val commands: Linear_Set[Command] = Linear_Set.empty)
   110   {
   111     def clear: Node = new Node(header = header)
   112 
   113     def update_header(new_header: Node_Header): Node =
   114       new Node(new_header, perspective, blobs, commands)
   115 
   116     def update_perspective(new_perspective: Command.Perspective): Node =
   117       new Node(header, new_perspective, blobs, commands)
   118 
   119     def update_blobs(new_blobs: Map[String, Blob]): Node =
   120       new Node(header, perspective, new_blobs, commands)
   121 
   122     def update_commands(new_commands: Linear_Set[Command]): Node =
   123       new Node(header, perspective, blobs, new_commands)
   124 
   125     def imports: List[Node.Name] =
   126       header match { case Exn.Res(deps) => deps.imports case _ => Nil }
   127 
   128     def keywords: List[Outer_Syntax.Decl] =
   129       header match { case Exn.Res(deps) => deps.keywords case _ => Nil }
   130 
   131 
   132     /* commands */
   133 
   134     private lazy val full_index: (Array[(Command, Text.Offset)], Text.Range) =
   135     {
   136       val blocks = new mutable.ListBuffer[(Command, Text.Offset)]
   137       var next_block = 0
   138       var last_stop = 0
   139       for ((command, start) <- Node.command_starts(commands.iterator)) {
   140         last_stop = start + command.length
   141         while (last_stop + 1 > next_block) {
   142           blocks += (command -> start)
   143           next_block += Node.block_size
   144         }
   145       }
   146       (blocks.toArray, Text.Range(0, last_stop))
   147     }
   148 
   149     def full_range: Text.Range = full_index._2
   150 
   151     def command_range(i: Text.Offset = 0): Iterator[(Command, Text.Offset)] =
   152     {
   153       if (!commands.isEmpty && full_range.contains(i)) {
   154         val (cmd0, start0) = full_index._1(i / Node.block_size)
   155         Node.command_starts(commands.iterator(cmd0), start0) dropWhile {
   156           case (cmd, start) => start + cmd.length <= i }
   157       }
   158       else Iterator.empty
   159     }
   160 
   161     def command_range(range: Text.Range): Iterator[(Command, Text.Offset)] =
   162       command_range(range.start) takeWhile { case (_, start) => start < range.stop }
   163 
   164     def command_at(i: Text.Offset): Option[(Command, Text.Offset)] =
   165     {
   166       val range = command_range(i)
   167       if (range.hasNext) Some(range.next) else None
   168     }
   169 
   170     def command_start(cmd: Command): Option[Text.Offset] =
   171       Node.command_starts(commands.iterator).find(_._1 == cmd).map(_._2)
   172   }
   173 
   174 
   175   /* development graph */
   176 
   177   object Nodes
   178   {
   179     val empty: Nodes = new Nodes(Graph.empty(Node.Name.Ordering))
   180   }
   181 
   182   final class Nodes private(graph: Graph[Node.Name, Node])
   183   {
   184     def get_name(s: String): Option[Node.Name] =
   185       graph.keys.find(name => name.node == s)
   186 
   187     def apply(name: Node.Name): Node =
   188       graph.default_node(name, Node.empty).get_node(name)
   189 
   190     def + (entry: (Node.Name, Node)): Nodes =
   191     {
   192       val (name, node) = entry
   193       val imports = node.imports
   194       val graph1 =
   195         (graph.default_node(name, Node.empty) /: imports)((g, p) => g.default_node(p, Node.empty))
   196       val graph2 = (graph1 /: graph1.imm_preds(name))((g, dep) => g.del_edge(dep, name))
   197       val graph3 = (graph2 /: imports)((g, dep) => g.add_edge(dep, name))
   198       new Nodes(graph3.map_node(name, _ => node))
   199     }
   200 
   201     def entries: Iterator[(Node.Name, Node)] =
   202       graph.entries.map({ case (name, (node, _)) => (name, node) })
   203 
   204     def descendants(names: List[Node.Name]): List[Node.Name] = graph.all_succs(names)
   205     def topological_order: List[Node.Name] = graph.topological_order
   206   }
   207 
   208 
   209 
   210   /** versioning **/
   211 
   212   /* particular document versions */
   213 
   214   object Version
   215   {
   216     val init: Version = new Version()
   217 
   218     def make(syntax: Outer_Syntax, nodes: Nodes): Version =
   219       new Version(new_id(), syntax, nodes)
   220   }
   221 
   222   final class Version private(
   223     val id: Version_ID = no_id,
   224     val syntax: Outer_Syntax = Outer_Syntax.empty,
   225     val nodes: Nodes = Nodes.empty)
   226   {
   227     def is_init: Boolean = id == no_id
   228   }
   229 
   230 
   231   /* changes of plain text, eventually resulting in document edits */
   232 
   233   object Change
   234   {
   235     val init: Change = new Change()
   236 
   237     def make(previous: Future[Version], edits: List[Edit_Text], version: Future[Version]): Change =
   238       new Change(Some(previous), edits, version)
   239   }
   240 
   241   final class Change private(
   242     val previous: Option[Future[Version]] = Some(Future.value(Version.init)),
   243     val edits: List[Edit_Text] = Nil,
   244     val version: Future[Version] = Future.value(Version.init))
   245   {
   246     def is_finished: Boolean =
   247       (previous match { case None => true case Some(future) => future.is_finished }) &&
   248       version.is_finished
   249 
   250     def truncate: Change = new Change(None, Nil, version)
   251   }
   252 
   253 
   254   /* history navigation */
   255 
   256   object History
   257   {
   258     val init: History = new History()
   259   }
   260 
   261   final class History private(
   262     val undo_list: List[Change] = List(Change.init))  // non-empty list
   263   {
   264     def tip: Change = undo_list.head
   265     def + (change: Change): History = new History(change :: undo_list)
   266 
   267     def prune(check: Change => Boolean, retain: Int): Option[(List[Change], History)] =
   268     {
   269       val n = undo_list.iterator.zipWithIndex.find(p => check(p._1)).get._2 + 1
   270       val (retained, dropped) = undo_list.splitAt(n max retain)
   271 
   272       retained.splitAt(retained.length - 1) match {
   273         case (prefix, List(last)) => Some(dropped, new History(prefix ::: List(last.truncate)))
   274         case _ => None
   275       }
   276     }
   277   }
   278 
   279 
   280 
   281   /** global state -- document structure, execution process, editing history **/
   282 
   283   abstract class Snapshot
   284   {
   285     val state: State
   286     val version: Version
   287     val node: Node
   288     val is_outdated: Boolean
   289     def convert(i: Text.Offset): Text.Offset
   290     def convert(range: Text.Range): Text.Range
   291     def revert(i: Text.Offset): Text.Offset
   292     def revert(range: Text.Range): Text.Range
   293     def cumulate_markup[A](range: Text.Range, info: A, elements: Option[Set[String]],
   294       result: PartialFunction[(A, Text.Markup), A]): Stream[Text.Info[A]]
   295     def select_markup[A](range: Text.Range, elements: Option[Set[String]],
   296       result: PartialFunction[Text.Markup, A]): Stream[Text.Info[A]]
   297   }
   298 
   299   type Assign = List[(Document.Command_ID, Option[Document.Exec_ID])]  // exec state assignment
   300 
   301   object State
   302   {
   303     class Fail(state: State) extends Exception
   304 
   305     object Assignment
   306     {
   307       val init: Assignment = new Assignment()
   308     }
   309 
   310     final class Assignment private(
   311       val command_execs: Map[Command_ID, Exec_ID] = Map.empty,
   312       val is_finished: Boolean = false)
   313     {
   314       def check_finished: Assignment = { require(is_finished); this }
   315       def unfinished: Assignment = new Assignment(command_execs, false)
   316 
   317       def assign(add_command_execs: List[(Command_ID, Option[Exec_ID])]): Assignment =
   318       {
   319         require(!is_finished)
   320         val command_execs1 =
   321           (command_execs /: add_command_execs) {
   322             case (res, (command_id, None)) => res - command_id
   323             case (res, (command_id, Some(exec_id))) => res + (command_id -> exec_id)
   324           }
   325         new Assignment(command_execs1, true)
   326       }
   327     }
   328 
   329     val init: State =
   330       State().define_version(Version.init, Assignment.init).assign(Version.init.id)._2
   331   }
   332 
   333   final case class State private(
   334     val versions: Map[Version_ID, Version] = Map.empty,
   335     val commands: Map[Command_ID, Command.State] = Map.empty,  // static markup from define_command
   336     val execs: Map[Exec_ID, Command.State] = Map.empty,  // dynamic markup from execution
   337     val assignments: Map[Version_ID, State.Assignment] = Map.empty,
   338     val history: History = History.init)
   339   {
   340     private def fail[A]: A = throw new State.Fail(this)
   341 
   342     def define_version(version: Version, assignment: State.Assignment): State =
   343     {
   344       val id = version.id
   345       copy(versions = versions + (id -> version),
   346         assignments = assignments + (id -> assignment.unfinished))
   347     }
   348 
   349     def define_command(command: Command): State =
   350     {
   351       val id = command.id
   352       copy(commands = commands + (id -> command.empty_state))
   353     }
   354 
   355     def defined_command(id: Command_ID): Boolean = commands.isDefinedAt(id)
   356 
   357     def find_command(version: Version, id: ID): Option[(Node, Command)] =
   358       commands.get(id) orElse execs.get(id) match {
   359         case None => None
   360         case Some(st) =>
   361           val command = st.command
   362           val node = version.nodes(command.node_name)
   363           Some((node, command))
   364       }
   365 
   366     def the_version(id: Version_ID): Version = versions.getOrElse(id, fail)
   367     def the_command(id: Command_ID): Command.State = commands.getOrElse(id, fail)  // FIXME rename
   368     def the_exec(id: Exec_ID): Command.State = execs.getOrElse(id, fail)
   369     def the_assignment(version: Version): State.Assignment =
   370       assignments.getOrElse(version.id, fail)
   371 
   372     def accumulate(id: ID, message: XML.Elem): (Command.State, State) =
   373       execs.get(id) match {
   374         case Some(st) =>
   375           val new_st = st + message
   376           (new_st, copy(execs = execs + (id -> new_st)))
   377         case None =>
   378           commands.get(id) match {
   379             case Some(st) =>
   380               val new_st = st + message
   381               (new_st, copy(commands = commands + (id -> new_st)))
   382             case None => fail
   383           }
   384       }
   385 
   386     def assign(id: Version_ID, command_execs: Assign = Nil): (List[Command], State) =
   387     {
   388       val version = the_version(id)
   389 
   390       val (changed_commands, new_execs) =
   391         ((Nil: List[Command], execs) /: command_execs) {
   392           case ((commands1, execs1), (cmd_id, exec)) =>
   393             val st = the_command(cmd_id)
   394             val commands2 = st.command :: commands1
   395             val execs2 =
   396               exec match {
   397                 case None => execs1
   398                 case Some(exec_id) => execs1 + (exec_id -> st)
   399               }
   400             (commands2, execs2)
   401         }
   402       val new_assignment = the_assignment(version).assign(command_execs)
   403       val new_state = copy(assignments = assignments + (id -> new_assignment), execs = new_execs)
   404 
   405       (changed_commands, new_state)
   406     }
   407 
   408     def is_assigned(version: Version): Boolean =
   409       assignments.get(version.id) match {
   410         case Some(assgn) => assgn.is_finished
   411         case None => false
   412       }
   413 
   414     def is_stable(change: Change): Boolean =
   415       change.is_finished && is_assigned(change.version.get_finished)
   416 
   417     def recent_finished: Change = history.undo_list.find(_.is_finished) getOrElse fail
   418     def recent_stable: Change = history.undo_list.find(is_stable) getOrElse fail
   419     def tip_stable: Boolean = is_stable(history.tip)
   420     def tip_version: Version = history.tip.version.get_finished
   421 
   422     def continue_history(
   423         previous: Future[Version],
   424         edits: List[Edit_Text],
   425         version: Future[Version]): (Change, State) =
   426     {
   427       val change = Change.make(previous, edits, version)
   428       (change, copy(history = history + change))
   429     }
   430 
   431     def prune_history(retain: Int = 0): (List[Version], State) =
   432     {
   433       history.prune(is_stable, retain) match {
   434         case Some((dropped, history1)) =>
   435           val dropped_versions = dropped.map(change => change.version.get_finished)
   436           val state1 = copy(history = history1)
   437           (dropped_versions, state1)
   438         case None => fail
   439       }
   440     }
   441 
   442     def removed_versions(removed: List[Version_ID]): State =
   443     {
   444       val versions1 = versions -- removed
   445       val assignments1 = assignments -- removed
   446       var commands1 = Map.empty[Command_ID, Command.State]
   447       var execs1 = Map.empty[Exec_ID, Command.State]
   448       for {
   449         (version_id, version) <- versions1.iterator
   450         command_execs = assignments1(version_id).command_execs
   451         (_, node) <- version.nodes.entries
   452         command <- node.commands.iterator
   453       } {
   454         val id = command.id
   455         if (!commands1.isDefinedAt(id) && commands.isDefinedAt(id))
   456           commands1 += (id -> commands(id))
   457         if (command_execs.isDefinedAt(id)) {
   458           val exec_id = command_execs(id)
   459           if (!execs1.isDefinedAt(exec_id) && execs.isDefinedAt(exec_id))
   460             execs1 += (exec_id -> execs(exec_id))
   461         }
   462       }
   463       copy(versions = versions1, commands = commands1, execs = execs1, assignments = assignments1)
   464     }
   465 
   466     def command_state(version: Version, command: Command): Command.State =
   467     {
   468       require(is_assigned(version))
   469       try {
   470         the_exec(the_assignment(version).check_finished.command_execs
   471           .getOrElse(command.id, fail))
   472       }
   473       catch { case _: State.Fail => command.empty_state }
   474     }
   475 
   476 
   477     // persistent user-view
   478     def snapshot(name: Node.Name, pending_edits: List[Text.Edit]): Snapshot =
   479     {
   480       val stable = recent_stable
   481       val latest = history.tip
   482 
   483       // FIXME proper treatment of removed nodes
   484       val edits =
   485         (pending_edits /: history.undo_list.takeWhile(_ != stable))((edits, change) =>
   486             (for ((a, Node.Edits(es)) <- change.edits if a == name) yield es).flatten ::: edits)
   487       lazy val reverse_edits = edits.reverse
   488 
   489       new Snapshot
   490       {
   491         val state = State.this
   492         val version = stable.version.get_finished
   493         val node = version.nodes(name)
   494         val is_outdated = !(pending_edits.isEmpty && latest == stable)
   495 
   496         def convert(offset: Text.Offset) = (offset /: edits)((i, edit) => edit.convert(i))
   497         def revert(offset: Text.Offset) = (offset /: reverse_edits)((i, edit) => edit.revert(i))
   498         def convert(range: Text.Range) = (range /: edits)((r, edit) => edit.convert(r))
   499         def revert(range: Text.Range) = (range /: reverse_edits)((r, edit) => edit.revert(r))
   500 
   501         def cumulate_markup[A](range: Text.Range, info: A, elements: Option[Set[String]],
   502           result: PartialFunction[(A, Text.Markup), A]): Stream[Text.Info[A]] =
   503         {
   504           val former_range = revert(range)
   505           for {
   506             (command, command_start) <- node.command_range(former_range).toStream
   507             Text.Info(r0, a) <- state.command_state(version, command).markup.
   508               cumulate[A]((former_range - command_start).restrict(command.range), info, elements,
   509                 {
   510                   case (a, Text.Info(r0, b))
   511                   if result.isDefinedAt((a, Text.Info(convert(r0 + command_start), b))) =>
   512                     result((a, Text.Info(convert(r0 + command_start), b)))
   513                 })
   514           } yield Text.Info(convert(r0 + command_start), a)
   515         }
   516 
   517         def select_markup[A](range: Text.Range, elements: Option[Set[String]],
   518           result: PartialFunction[Text.Markup, A]): Stream[Text.Info[A]] =
   519         {
   520           val result1 =
   521             new PartialFunction[(Option[A], Text.Markup), Option[A]] {
   522               def isDefinedAt(arg: (Option[A], Text.Markup)): Boolean = result.isDefinedAt(arg._2)
   523               def apply(arg: (Option[A], Text.Markup)): Option[A] = Some(result(arg._2))
   524             }
   525           for (Text.Info(r, Some(x)) <- cumulate_markup(range, None, elements, result1))
   526             yield Text.Info(r, x)
   527         }
   528       }
   529     }
   530   }
   531 }
   532